I watched this prior to reading Beevor's book 'The Fall of Berlin'. It follows the book exactly - the dramatization of the scene where the German general is called to the bunker to be shot, before finding out he has been promoted, really stuck in my head. Beevor's description is very similar.
The guy playing Hitler is brilliant. I loved the bit when he finds out Himmler has betrayed him. "Nicht Himmler, Die Trauest of the die traue!!!!!?" Or something like that. I thought, yes you salamander. Finally you see you were in league with a set of prize back-stabbers.
I liked how Hitler's secretary finally has her eyes opened after being closeted in the bunker, protected from the suffering and death above ground. Quite poignant.
And yes, insanity is the word.